How Many Carbohydrates Are In a Cucumber? | Carb Count Math

A raw cucumber has about 3.6 grams of carbohydrates per 100 grams, and peeled cucumber has about 2.2 grams.

Cucumbers are one of those foods that sound almost carb-free, but the real number depends on one thing: how much you eat. A few salad slices barely move the needle. A full large cucumber gives you more carbs, still in a modest range for most eating plans.

If you want the cleanest starting point, use the 100-gram benchmark. That keeps the math steady and makes label-style comparisons easier. From there, you can scale the number up or down for slices, half a cucumber, or a whole one.

What The USDA Data Says

The plain USDA baseline for raw cucumber with the peel is 3.63 grams of total carbohydrate per 100 grams. That same 100-gram serving has about 0.5 grams of fiber and 1.7 grams of sugars. Peel the cucumber, and the carb count drops to about 2.16 grams per 100 grams.

That gap is why there isn’t one single answer that fits every cucumber on your cutting board. English cucumbers, garden cucumbers, Persian cucumbers, and peeled chunks all land a little differently. Weight matters more than the name on the bin.

Why The Number Changes

Three things shift the total:

• Size: A small cucumber and a large one can be far apart in weight.
• Prep: The peel adds a bit of carbohydrate and fiber.
• Portion: A few slices are tiny in carb terms. A whole cucumber is still light, but not zero.

If you like checking the source yourself, the USDA’s FoodData Central entry for raw cucumber with peel gives the benchmark most carb counts start from. The peeled version also has its own USDA search listing for cucumber, peeled, raw, which helps when you’re logging food more closely.

How Cucumber Type Changes The Count

People often ask whether English, Persian, or standard garden cucumbers have different carb counts. They can, but the bigger swing still comes from weight. A long English cucumber may look lean and watery, yet the total carbs climb once you eat the whole thing because you’re eating more grams.

Persian cucumbers are a good case in point. One piece is small, so the carb total per cucumber looks tiny. Eat four or five at once, and the math starts to look more like one larger cucumber. The same food, the same basic carb pattern, just a different portion.

• English cucumber: Often longer, with more edible weight in one piece.
• Persian cucumber: Small per piece, easy to undercount when you grab a handful.
• Garden cucumber: More size swing from one cucumber to the next.

Seeds don’t change the story much. The water content is still high, and total carbohydrate stays modest. The cleaner way to log any type is to weigh what lands on the plate.

Carbohydrates In A Cucumber By Size And Prep

The numbers below use the USDA 100-gram values as the anchor, then scale them to portions people actually eat. Whole-cucumber rows are ranges on purpose. Produce isn’t factory-cut, so one “medium” cucumber can weigh a lot more than another.

That’s the part many carb charts gloss over. They give one neat number for “1 cucumber” and act like it settles the matter. It doesn’t. Weight gets you closer to the real answer.

Serving	Approx. Weight	Carbohydrates
Cucumber, with peel, raw	100 g	3.6 g
Cucumber, peeled, raw	100 g	2.2 g
Sliced cucumber with peel	1/2 cup	About 1.8 g
Sliced cucumber with peel	1 cup	About 3.8 g
Small whole cucumber with peel	140–180 g	About 5.1–6.5 g
Medium whole cucumber with peel	200–280 g	About 7.3–10.2 g
Large whole cucumber with peel	300–380 g	About 10.9–13.8 g
Half of a medium cucumber with peel	100–140 g	About 3.6–5.1 g

What The Peel Changes

The peel doesn’t turn cucumber into a high-carb food. It just nudges the number up a little. In return, you keep a bit more fiber, texture, and crunch. If you enjoy cucumber skin and it’s washed well, there’s no carb reason to strip it off unless you want a softer bite.

That also means “peeled cucumber” and “cucumber” aren’t perfect substitutes in a food log. The gap is small, but it’s real. If you track closely, choose the entry that matches what you ate.

Net Carbs, Fiber, And Sugars

Total carbohydrate is the broad number people see first. Net carbs are usually figured by subtracting fiber from total carbs. Using the raw cucumber with peel benchmark, 100 grams lands at about 3.1 grams of net carbs. Peeled cucumber comes in lower still.

Here’s a practical way to read it:

• Total carbs tell you the full carb count.
• Fiber is small in cucumber, but the peel helps.
• Sugars are present, though the amount is still modest.

On packaged foods, carb percentages are often judged against the FDA’s Daily Value for total carbohydrate, which is 275 grams on a 2,000-calorie diet. A cup of sliced cucumber barely dents that figure.

Best Ways To Count Cucumber Carbs

If you want a number that holds up, don’t guess by sight. Use one of these methods and you’ll stay close enough for real life:

1. Weigh it raw. Multiply the grams by 0.0363 for cucumber with peel, or by 0.0216 for peeled cucumber.
2. Use cup measures when you need speed. One cup of sliced cucumber with peel lands around 3.8 grams of carbs.
3. Log the prep style correctly. “With peel” and “peeled” are not the same entry.
4. Treat whole-cucumber counts as ranges. Produce size swings too much for one tidy number.

Say your salad has 150 grams of sliced cucumber with peel. The carb math is simple: 150 × 0.0363 = 5.45 grams of total carbohydrate. That’s still a light carb load for a pretty generous serving.

Measure	Raw With Peel, 100 g	What It Tells You
Total carbohydrate	3.63 g	Main carb benchmark
Fiber	About 0.5 g	Small, but the peel adds some
Sugars	About 1.7 g	Natural sugars, still modest
Net carbs	About 3.1 g	Total carbs minus fiber

Common Mistakes When Counting Cucumber Carbs

The usual mistake is logging “1 cucumber” with no size check. That can be close enough on one day and way off on the next. Another slip is mixing raw cucumber entries with pickles or sweet cucumber salads, which can carry added sugar and a different carb profile.

It also helps to separate the cucumber from the rest of the bowl. A cucumber-tomato salad with onions, chickpeas, croutons, and sweet dressing is not a cucumber carb count. It’s a mixed dish carb count.

• Raw cucumber: Low-carb on its own.
• Pickled cucumber: Check the label, since sweet styles can jump fast.
• Creamy salads and dips: Count the added ingredients, not just the cucumber.

When A Cucumber Fits A Low-Carb Plate

Most people can work cucumber into a lower-carb meal without much thought. It adds bulk, crunch, and freshness with far fewer carbs than starchy sides or sweeter fruits. That’s why it shows up so often in salads, yogurt dips, snack boxes, and sandwich plates.

The main trap is not the cucumber itself. It’s what lands next to it. Sugary dressings, sweet pickles, breaded toppings, and large bowls with beans, corn, or croutons can push the carb count up fast. Plain raw cucumber rarely does that on its own.

If all you wanted was the clean answer, here it is again in plain terms: raw cucumber with peel has about 3.6 grams of carbs per 100 grams, and peeled raw cucumber has about 2.2 grams. For most portions, that puts cucumber on the low end of the carb scale.